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    <title>174-js撤销重做功能</title>
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            <a href="./简单的撤销重做实现.html">简单的撤销重做实现.html</a>
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            借助 immutable.js 实现更加完善的 undo redo 功能
            <a href="https://immutable-js.com/docs/v4.1.0" target="_blank">immutable.js 文档</a>
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          <a href="./immutable-undo-redo.html">immutable-undo-redo.html</a>
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